content: /*
   * Copyright 2017 David Karnok
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package hu.akarnokd.reactive4javaflow.impl.operators;
  
  import hu.akarnokd.reactive4javaflow.*;
  
  import java.util.concurrent.*;
  
  public final class FolyamDelayTime<T> extends Folyam<T> {
  
      final Folyam<T> source;
  
      final long delay;
  
      final TimeUnit unit;
  
      final SchedulerService executor;
  
      public FolyamDelayTime(Folyam<T> source, long delay, TimeUnit unit, SchedulerService executor) {
          this.source = source;
          this.delay = delay;
          this.unit = unit;
          this.executor = executor;
      }
  
  
      @Override
      protected void subscribeActual(FolyamSubscriber<? super T> s) {
          source.subscribe(new DelaySubscriber<>(s, delay, unit, executor.worker()));
      }
  
      static final class DelaySubscriber<T> implements FolyamSubscriber<T>, Flow.Subscription, Runnable {
  
          final FolyamSubscriber<? super T> actual;
  
          final SchedulerService.Worker worker;
  
          final long delay;
  
          final TimeUnit unit;
  
          Flow.Subscription upstream;
  
          Throwable error;
  
          DelaySubscriber(FolyamSubscriber<? super T> actual, long delay, TimeUnit unit, SchedulerService.Worker worker) {
              this.actual = actual;
              this.delay = delay;
              this.unit = unit;
              this.worker = worker;
          }
  
          @Override
          public void onSubscribe(Flow.Subscription subscription) {
              upstream = subscription;
              actual.onSubscribe(this);
          }
  
          @Override
          public void onNext(T item) {
              worker.schedule(() -> actual.onNext(item), delay, unit);
          }
  
          @Override
          public void onError(Throwable throwable) {
              error = throwable;
              worker.schedule(this, delay, unit);
          }
  
          @Override
          public void onComplete() {
              worker.schedule(this, delay, unit);
          }
  
          @Override
          public void run() {
              Throwable ex = error;
              if (ex == null) {
                  actual.onComplete();
              } else {
                  actual.onError(ex);
              }
              worker.close();
          }
  
          @Override
          public void request(long n) {
              upstream.request(n);
          }
  
          @Override
          public void cancel() {
              upstream.cancel();
              worker.close();
          }
      }
  }
  